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x in (-oo:+oo)
x/2-4 < 6 // - 6
x/2-6-4 < 0
1/2*x-10 < 0 // + 10
1/2*x < 10 // : 1/2
x < 10/1/2
x < 20
x in (-oo:20)
(-oo:20)
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